EurekaMag.com logo
+ Site Statistics
References:
53,623,987
Abstracts:
29,492,080
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Endoscopic laser treatment part 2 comparison of the efficacy of high and low power photo coagulation in control of severely bleeding experimental ulcers in dogs



Endoscopic laser treatment part 2 comparison of the efficacy of high and low power photo coagulation in control of severely bleeding experimental ulcers in dogs



Gastroenterology 73(3): 481-486



The coagulative efficacy of a high power argon laser which delivers 6.5 .+-. 1.0 W was compared to that of a low power argon laser which delivers 1.0 .+-. 0.1 W. The wave-guide angle of divergence was 8.degree. For the high power laser the distance between the wave-guide tip and the mucosa varied from 1.0-1.5 cm with a delivered power density range of 160-487 W/cm2. For the low power laser the distance between the tip and mucosa varied from 0.7-1.3 cm with a power density of 35-146 W/cm2. Group A consisted of acute experiments in 6 heparinized dogs in which 51 standard-sized acute gastric ulcers extending into the submucosa were made at laparotomy via a large gastrotomy. Ulcer bleeding rates were quantified into 3 categories of severity. Within each category ulcers were randomized to high power, low power or untreated control. All 19 low power-treated ulcers and 16 untreated controls continued bleeding; 13 of 16 high power-treated ulcers stopped bleeding completely. Representative ulcers were examined histologically. Group B consisted of chronic experiments on 31 ulcers in 7 unheparinized dogs. These ulcers were either treated with high power or left as untreated controls. Dogs were killed and the ulcers examined histologically at 7, 14 and 28 days. Only rarely did the laser injury penetrate into the muscularis externa. There were no perforations. By 14 days all lesions were covered with normal surface epithelium. These data encourage further development of .simeq. 7.0 W argon laser photocoagulation for eventual clinical use in man.

(PDF emailed within 1 workday: $29.90)

Accession: 005359354

Download citation: RISBibTeXText



Related references

Endoscopic laser treatment. II. Comparison of the efficacy of high and low power photocoagulation in control of severely bleeding experimental ulcers in dogs. Gastroenterology 73(3): 481-486, 1977

Endoscopic carbon di oxide assisted argon laser photo coagulation of experimental bleeding ulcers effect of varying laser power on efficacy and safety. Clinical Research 27(1): 26A, 1979

Endoscopic laser treatment part 3 development and testing of a gas jet assisted argon laser waveguide in control of bleeding experimental ulcers. Gastroenterology 74((2 PART 1)): 232-239, 1978

High power argon laser treatment via standard endoscopes part 1 a preliminary study of efficacy in control of experimental erosive bleeding. Gastroenterology 71(4): 558-563, 1976

Comparison of a new method of electro coagulation and yttrium aluminum garnet laser photo coagulation in the treatment of bleeding canine gastric ulcers. Gastroenterology 76(5 PART 2): 1128, 1979

Comparison of laser photo coagulation and electro coagulation in endoscopic treatment of upper gastro intestinal bleeding. Gastroenterology 76(5 PART 2): 1162, 1979

Fiber endoscopic control of experimental gastric bleeding by laser photo coagulation. Gastroenterology 68(4 PART 2): 1046, 1975

Randomized trial of endoscopic argon laser photo coagulation in bleeding peptic ulcers. Gut 22(3): 228-233, 1981

Randomized study of endoscopic argon laser photo coagulation in bleeding peptic ulcers. Gastrointestinal Endoscopy 26(2): 79, 1980

Endoscopic laser treatment. III. Development and testing of a gas-jet-assisted argon laser waveguide in control of bleeding experimental ulcers. Gastroenterology 74(2 Pt 1): 232-239, 1978

High power argon laser treatment via standard endoscopes. I. A preliminary study of efficacy in control of experimental erosive bleeding. Gastroenterology 71(4): 558-563, 1976

The neodymium yttrium aluminum garnet laser is dangerous for photo coagulation of experimental bleeding gastric ulcers when compared with the argon laser. Gastroenterology 74(5 PART 2): 1080, 1978

Endoscopic treatment of telangi ectasia with argon laser photo coagulation and bi polar electro coagulation in patients with chronic gastro intestinal bleeding. Gastrointestinal Endoscopy 26(2): 69, 1980

Randomized comparison of endoscopic microwave coagulation and endoscopic sclerosis in the treatment of bleeding peptic ulcers. Gastrointestinal Endoscopy 37(6): 611-616, 1991

Efficiency comparison of the argon laser and the high pressure xenon arc lamp in the treatment of retinopathy by photo coagulation part 1 theoretical aspects of photo therapy side effects and apparatus. Albrecht Von Graefes Archiv fuer Klinische und Experimentelle Ophthalmologie 183(4): 334-347, 1972